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These NTSC filters replicate the cables used to connect the system to the TV. They vary in quality, with the lowest being RF, then composite, then s-video and RGB (scart) being the highest quality. Many emulators have NTSC filters built into them. They can also be separately downloaded in .filter format. They were developed by [http://slack.net/~ant/libs/ntsc.html blargg]. Other NTSC shaders have been created which do not rely upon blargg's shaders.
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The level of blur in RF and composite cables are needed for [[dithering]] to work. S-video, and RGB are too clear to produce dithering.
Blargg's NTSC shaders are powerful, and well made, but they are very system specific. They are designed for NES-SNES resolutions. Certain games on other systems however, can still make use of them, but not without glitches. For instance, certain [[PS1]] games with have multiple resolutions, some of them will work properly with them (such as 240p), and some won't. This may mean the aspect ratio is horribly messed up for menus, but the main gameplay will look normal.
===Maister NTSC===
https://github.com/libretro/common-shaders/tree/master/ntsc
The standalone .fliter filter files work at resolutions typically found in NES and SNES games, and cause problems when used on systems that use other resolutions. For this reason, there have been attempts at making an NTSC shader that can work on many different consoles and resolutions.
Maister has created an NTSC shader using the .cg format. Insert screenshots.
